dyngen.c

   1 /*
   2  *  Generic Dynamic compiler generator
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <stdarg.h>
  24 #include <inttypes.h>
  25 #include <elf.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28
  29 #include "thunk.h"
  30
  31 /* all dynamically generated functions begin with this code */
  32 #define OP_PREFIX "op_"
  33
  34 int elf_must_swap(Elf32_Ehdr *h)
  35 {
  36   union {
  37       uint32_t i;
  38       uint8_t b[4];
  39   } swaptest;
  40
  41   swaptest.i = 1;
  42   return (h->e_ident[EI_DATA] == ELFDATA2MSB) !=
  43       (swaptest.b[0] == 0);
  44 }
  45
  46 void swab16s(uint16_t *p)
  47 {
  48     *p = bswap16(*p);
  49 }
  50
  51 void swab32s(uint32_t *p)
  52 {
  53     *p = bswap32(*p);
  54 }
  55
  56 void swab64s(uint32_t *p)
  57 {
  58     *p = bswap64(*p);
  59 }
  60
  61 void elf_swap_ehdr(Elf32_Ehdr *h)
  62 {
  63     swab16s(&h->e_type);                        /* Object file type */
  64     swab16s(&h->        e_machine);             /* Architecture */
  65     swab32s(&h->        e_version);             /* Object file version */
  66     swab32s(&h->        e_entry);               /* Entry point virtual address */
  67     swab32s(&h->        e_phoff);               /* Program header table file offset */
  68     swab32s(&h->        e_shoff);               /* Section header table file offset */
  69     swab32s(&h->        e_flags);               /* Processor-specific flags */
  70     swab16s(&h->        e_ehsize);              /* ELF header size in bytes */
  71     swab16s(&h->        e_phentsize);           /* Program header table entry size */
  72     swab16s(&h->        e_phnum);               /* Program header table entry count */
  73     swab16s(&h->        e_shentsize);           /* Section header table entry size */
  74     swab16s(&h->        e_shnum);               /* Section header table entry count */
  75     swab16s(&h->        e_shstrndx);            /* Section header string table index */
  76 }
  77
  78 void elf_swap_shdr(Elf32_Shdr *h)
  79 {
  80   swab32s(&h->  sh_name);               /* Section name (string tbl index) */
  81   swab32s(&h->  sh_type);               /* Section type */
  82   swab32s(&h->  sh_flags);              /* Section flags */
  83   swab32s(&h->  sh_addr);               /* Section virtual addr at execution */
  84   swab32s(&h->  sh_offset);             /* Section file offset */
  85   swab32s(&h->  sh_size);               /* Section size in bytes */
  86   swab32s(&h->  sh_link);               /* Link to another section */
  87   swab32s(&h->  sh_info);               /* Additional section information */
  88   swab32s(&h->  sh_addralign);          /* Section alignment */
  89   swab32s(&h->  sh_entsize);            /* Entry size if section holds table */
  90 }
  91
  92 void elf_swap_phdr(Elf32_Phdr *h)
  93 {
  94     swab32s(&h->p_type);                        /* Segment type */
  95     swab32s(&h->p_offset);              /* Segment file offset */
  96     swab32s(&h->p_vaddr);               /* Segment virtual address */
  97     swab32s(&h->p_paddr);               /* Segment physical address */
  98     swab32s(&h->p_filesz);              /* Segment size in file */
  99     swab32s(&h->p_memsz);               /* Segment size in memory */
 100     swab32s(&h->p_flags);               /* Segment flags */
 101     swab32s(&h->p_align);               /* Segment alignment */
 102 }
 103
 104 int do_swap;
 105 int e_machine;
 106
 107 uint16_t get16(uint16_t *p)
 108 {
 109     uint16_t val;
 110     val = *p;
 111     if (do_swap)
 112         val = bswap16(val);
 113     return val;
 114 }
 115
 116 uint32_t get32(uint32_t *p)
 117 {
 118     uint32_t val;
 119     val = *p;
 120     if (do_swap)
 121         val = bswap32(val);
 122     return val;
 123 }
 124
 125 void put16(uint16_t *p, uint16_t val)
 126 {
 127     if (do_swap)
 128         val = bswap16(val);
 129     *p = val;
 130 }
 131
 132 void put32(uint32_t *p, uint32_t val)
 133 {
 134     if (do_swap)
 135         val = bswap32(val);
 136     *p = val;
 137 }
 138
 139 void __attribute__((noreturn)) error(const char *fmt, ...)
 140 {
 141     va_list ap;
 142     va_start(ap, fmt);
 143     fprintf(stderr, "dyngen: ");
 144     vfprintf(stderr, fmt, ap);
 145     fprintf(stderr, "\n");
 146     va_end(ap);
 147     exit(1);
 148 }
 149
 150
 151 Elf32_Shdr *find_elf_section(Elf32_Shdr *shdr, int shnum, const char *shstr,
 152                              const char *name)
 153 {
 154     int i;
 155     const char *shname;
 156     Elf32_Shdr *sec;
 157
 158     for(i = 0; i < shnum; i++) {
 159         sec = &shdr[i];
 160         if (!sec->sh_name)
 161             continue;
 162         shname = shstr + sec->sh_name;
 163         if (!strcmp(shname, name))
 164             return sec;
 165     }
 166     return NULL;
 167 }
 168
 169 void *load_data(int fd, long offset, unsigned int size)
 170 {
 171     char *data;
 172
 173     data = malloc(size);
 174     if (!data)
 175         return NULL;
 176     lseek(fd, offset, SEEK_SET);
 177     if (read(fd, data, size) != size) {
 178         free(data);
 179         return NULL;
 180     }
 181     return data;
 182 }
 183
 184 int strstart(const char *str, const char *val, const char **ptr)
 185 {
 186     const char *p, *q;
 187     p = str;
 188     q = val;
 189     while (*q != '\0') {
 190         if (*p != *q)
 191             return 0;
 192         p++;
 193         q++;
 194     }
 195     if (ptr)
 196         *ptr = p;
 197     return 1;
 198 }
 199
 200 #define MAX_ARGS 3
 201
 202 /* generate op code */
 203 void gen_code(const char *name, unsigned long offset, unsigned long size,
 204               FILE *outfile, uint8_t *text, void *relocs, int nb_relocs, int reloc_sh_type,
 205               Elf32_Sym *symtab, char *strtab, int gen_switch)
 206 {
 207     int copy_size = 0;
 208     uint8_t *p_start, *p_end;
 209     int nb_args, i;
 210     uint8_t args_present[MAX_ARGS];
 211     const char *sym_name, *p;
 212
 213     /* compute exact size excluding return instruction */
 214     p_start = text + offset;
 215     p_end = p_start + size;
 216     switch(e_machine) {
 217     case EM_386:
 218         {
 219             uint8_t *p;
 220             p = p_end - 1;
 221             if (p == p_start)
 222                 error("empty code for %s", name);
 223             if (p[0] != 0xc3)
 224                 error("ret expected at the end of %s", name);
 225             copy_size = p - p_start;
 226         }
 227         break;
 228     case EM_PPC:
 229         {
 230             uint8_t *p;
 231             p = (void *)(p_end - 4);
 232             if (p == p_start)
 233                 error("empty code for %s", name);
 234             if (get32((uint32_t *)p) != 0x4e800020)
 235                 error("blr expected at the end of %s", name);
 236             copy_size = p - p_start;
 237         }
 238         break;
 239     default:
 240         error("unsupported CPU (%d)", e_machine);
 241     }
 242
 243     /* compute the number of arguments by looking at the relocations */
 244     for(i = 0;i < MAX_ARGS; i++)
 245         args_present[i] = 0;
 246
 247     if (reloc_sh_type == SHT_REL) {
 248         Elf32_Rel *rel;
 249         int n;
 250         for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 251             if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
 252                 sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 253                 if (strstart(sym_name, "__op_param", &p)) {
 254                     n = strtoul(p, NULL, 10);
 255                     if (n >= MAX_ARGS)
 256                         error("too many arguments in %s", name);
 257                     args_present[n - 1] = 1;
 258                 }
 259             }
 260         }
 261     } else {
 262         Elf32_Rela *rel;
 263         int n;
 264         for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 265             if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
 266                 sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 267                 if (strstart(sym_name, "__op_param", &p)) {
 268                     n = strtoul(p, NULL, 10);
 269                     if (n >= MAX_ARGS)
 270                         error("too many arguments in %s", name);
 271                     args_present[n - 1] = 1;
 272                 }
 273             }
 274         }
 275     }
 276
 277     nb_args = 0;
 278     while (nb_args < MAX_ARGS && args_present[nb_args])
 279         nb_args++;
 280     for(i = nb_args; i < MAX_ARGS; i++) {
 281         if (args_present[i])
 282             error("inconsistent argument numbering in %s", name);
 283     }
 284
 285     if (gen_switch) {
 286
 287         /* output C code */
 288         fprintf(outfile, "case INDEX_%s: {\n", name);
 289         if (nb_args > 0) {
 290             fprintf(outfile, "    long ");
 291             for(i = 0; i < nb_args; i++) {
 292                 if (i != 0)
 293                     fprintf(outfile, ", ");
 294                 fprintf(outfile, "param%d", i + 1);
 295             }
 296             fprintf(outfile, ";\n");
 297         }
 298         fprintf(outfile, "    extern void %s();\n", name);
 299
 300         if (reloc_sh_type == SHT_REL) {
 301             Elf32_Rel *rel;
 302             for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 303                 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
 304                     sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 305                     if (!strstart(sym_name, "__op_param", &p)) {
 306                         fprintf(outfile, "extern char %s;\n", sym_name);
 307                     }
 308                 }
 309             }
 310         } else {
 311             Elf32_Rela *rel;
 312             for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 313                 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
 314                     sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 315                     if (!strstart(sym_name, "__op_param", &p)) {
 316                         fprintf(outfile, "extern char %s;\n", sym_name);
 317                     }
 318                 }
 319             }
 320         }
 321
 322         fprintf(outfile, "    memcpy(gen_code_ptr, &%s, %d);\n", name, copy_size);
 323         for(i = 0; i < nb_args; i++) {
 324             fprintf(outfile, "    param%d = *opparam_ptr++;\n", i + 1);
 325         }
 326
 327         /* patch relocations */
 328         switch(e_machine) {
 329         case EM_386:
 330             {
 331                 Elf32_Rel *rel;
 332                 char name[256];
 333                 int type;
 334                 long addend;
 335                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 336                 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
 337                     sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 338                     if (strstart(sym_name, "__op_param", &p)) {
 339                         snprintf(name, sizeof(name), "param%s", p);
 340                     } else {
 341                         snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 342                     }
 343                     type = ELF32_R_TYPE(rel->r_info);
 344                     addend = get32((uint32_t *)(text + rel->r_offset));
 345                     switch(type) {
 346                     case R_386_32:
 347                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %ld) = %s + %ld;\n",
 348                                 rel->r_offset - offset, name, addend);
 349                         break;
 350                     case R_386_PC32:
 351                         fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %ld) = %s - (long)(gen_code_ptr + %ld) + %ld;\n",
 352                                 rel->r_offset - offset, name, rel->r_offset - offset, addend);
 353                         break;
 354                     default:
 355                         error("unsupported i386 relocation (%d)", type);
 356                     }
 357                 }
 358                 }
 359             }
 360             break;
 361         case EM_PPC:
 362             {
 363                 Elf32_Rela *rel;
 364                 char name[256];
 365                 int type;
 366                 long addend;
 367                 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
 368                     if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
 369                         sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
 370                         if (strstart(sym_name, "__op_param", &p)) {
 371                             snprintf(name, sizeof(name), "param%s", p);
 372                         } else {
 373                             snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
 374                         }
 375                         type = ELF32_R_TYPE(rel->r_info);
 376                         addend = rel->r_addend;
 377                         switch(type) {
 378                         case R_PPC_ADDR32:
 379                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %ld) = %s + %ld;\n",
 380                                     rel->r_offset - offset, name, addend);
 381                             break;
 382                         case R_PPC_ADDR16_LO:
 383                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %ld) = (%s + %ld);\n",
 384                                     rel->r_offset - offset, name, addend);
 385                             break;
 386                         case R_PPC_ADDR16_HI:
 387                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %ld) = (%s + %ld) >> 16;\n",
 388                                     rel->r_offset - offset, name, addend);
 389                             break;
 390                         case R_PPC_ADDR16_HA:
 391                             fprintf(outfile, "    *(uint16_t *)(gen_code_ptr + %ld) = (%s + %ld + 0x8000) >> 16;\n",
 392                                     rel->r_offset - offset, name, addend);
 393                             break;
 394                         case R_PPC_REL24:
 395                             /* warning: must be at 32 MB distancy */
 396                             fprintf(outfile, "    *(uint32_t *)(gen_code_ptr + %ld) = (*(uint32_t *)(gen_code_ptr + %ld) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %ld) + %ld) & 0x03fffffc);\n",
 397                                     rel->r_offset - offset, rel->r_offset - offset, name, rel->r_offset - offset, addend);
 398                             break;
 399                         default:
 400                             error("unsupported powerpc relocation (%d)", type);
 401                         }
 402                     }
 403                 }
 404             }
 405             break;
 406         default:
 407             error("unsupported CPU for relocations (%d)", e_machine);
 408         }
 409         fprintf(outfile, "    gen_code_ptr += %d;\n", copy_size);
 410         fprintf(outfile, "}\n");
 411         fprintf(outfile, "break;\n\n");
 412     } else {
 413         fprintf(outfile, "static inline void gen_%s(", name);
 414         if (nb_args == 0) {
 415             fprintf(outfile, "void");
 416         } else {
 417             for(i = 0; i < nb_args; i++) {
 418                 if (i != 0)
 419                     fprintf(outfile, ", ");
 420                 fprintf(outfile, "long param%d", i + 1);
 421             }
 422         }
 423         fprintf(outfile, ")\n");
 424         fprintf(outfile, "{\n");
 425         for(i = 0; i < nb_args; i++) {
 426             fprintf(outfile, "    *gen_opparam_ptr++ = param%d;\n", i + 1);
 427         }
 428         fprintf(outfile, "    *gen_opc_ptr++ = INDEX_%s;\n", name);
 429         fprintf(outfile, "}\n\n");
 430     }
 431 }
 432
 433 /* load an elf object file */
 434 int load_elf(const char *filename, FILE *outfile, int do_print_enum)
 435 {
 436     int fd;
 437     Elf32_Ehdr ehdr;
 438     Elf32_Shdr *sec, *shdr, *symtab_sec, *strtab_sec, *text_sec;
 439     int i, j, nb_syms;
 440     Elf32_Sym *symtab, *sym;
 441     const char *cpu_name;
 442     char *shstr, *strtab;
 443     uint8_t *text;
 444     void *relocs;
 445     int nb_relocs, reloc_sh_type;
 446
 447     fd = open(filename, O_RDONLY);
 448     if (fd < 0)
 449         error("can't open file '%s'", filename);
 450
 451     /* Read ELF header.  */
 452     if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
 453         error("unable to read file header");
 454
 455     /* Check ELF identification.  */
 456     if (ehdr.e_ident[EI_MAG0] != ELFMAG0
 457      || ehdr.e_ident[EI_MAG1] != ELFMAG1
 458      || ehdr.e_ident[EI_MAG2] != ELFMAG2
 459      || ehdr.e_ident[EI_MAG3] != ELFMAG3
 460      || ehdr.e_ident[EI_CLASS] != ELFCLASS32
 461      || ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
 462         error("bad ELF header");
 463     }
 464
 465     do_swap = elf_must_swap(&ehdr);
 466     if (do_swap)
 467         elf_swap_ehdr(&ehdr);
 468     if (ehdr.e_type != ET_REL)
 469         error("ELF object file expected");
 470     if (ehdr.e_version != EV_CURRENT)
 471         error("Invalid ELF version");
 472     e_machine = ehdr.e_machine;
 473
 474     /* read section headers */
 475     shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(Elf32_Shdr));
 476     if (do_swap) {
 477         for(i = 0; i < ehdr.e_shnum; i++) {
 478             elf_swap_shdr(&shdr[i]);
 479         }
 480     }
 481
 482     sec = &shdr[ehdr.e_shstrndx];
 483     shstr = load_data(fd, sec->sh_offset, sec->sh_size);
 484
 485     /* text section */
 486
 487     text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
 488     if (!text_sec)
 489         error("could not find .text section");
 490     text = load_data(fd, text_sec->sh_offset, text_sec->sh_size);
 491
 492     /* find text relocations, if any */
 493     nb_relocs = 0;
 494     relocs = NULL;
 495     reloc_sh_type = 0;
 496     for(i = 0; i < ehdr.e_shnum; i++) {
 497         sec = &shdr[i];
 498         if ((sec->sh_type == SHT_REL || sec->sh_type == SHT_RELA) &&
 499             sec->sh_info == (text_sec - shdr)) {
 500             reloc_sh_type = sec->sh_type;
 501             relocs = load_data(fd, sec->sh_offset, sec->sh_size);
 502             nb_relocs = sec->sh_size / sec->sh_entsize;
 503             if (do_swap) {
 504                 if (sec->sh_type == SHT_REL) {
 505                     Elf32_Rel *rel = relocs;
 506                     for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) {
 507                         swab32s(&rel->r_offset);
 508                         swab32s(&rel->r_info);
 509                     }
 510                 } else {
 511                     Elf32_Rela *rel = relocs;
 512                     for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) {
 513                         swab32s(&rel->r_offset);
 514                         swab32s(&rel->r_info);
 515                         swab32s(&rel->r_addend);
 516                     }
 517                 }
 518             }
 519             break;
 520         }
 521     }
 522
 523     symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
 524     if (!symtab_sec)
 525         error("could not find .symtab section");
 526     strtab_sec = &shdr[symtab_sec->sh_link];
 527
 528     symtab = load_data(fd, symtab_sec->sh_offset, symtab_sec->sh_size);
 529     strtab = load_data(fd, strtab_sec->sh_offset, strtab_sec->sh_size);
 530
 531     nb_syms = symtab_sec->sh_size / sizeof(Elf32_Sym);
 532     if (do_swap) {
 533         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
 534             swab32s(&sym->st_name);
 535             swab32s(&sym->st_value);
 536             swab32s(&sym->st_size);
 537             swab16s(&sym->st_shndx);
 538         }
 539     }
 540
 541     switch(e_machine) {
 542     case EM_386:
 543         cpu_name = "i386";
 544         break;
 545     case EM_PPC:
 546         cpu_name = "ppc";
 547         break;
 548     case EM_MIPS:
 549         cpu_name = "mips";
 550         break;
 551     case EM_ARM:
 552         cpu_name = "arm";
 553         break;
 554     case EM_SPARC:
 555         cpu_name = "sparc";
 556         break;
 557     default:
 558         error("unsupported CPU (e_machine=%d)", e_machine);
 559     }
 560
 561     if (do_print_enum) {
 562         fprintf(outfile, "DEF(end)\n");
 563         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
 564             const char *name, *p;
 565             name = strtab + sym->st_name;
 566             if (strstart(name, OP_PREFIX, &p)) {
 567                 fprintf(outfile, "DEF(%s)\n", p);
 568             }
 569         }
 570     } else {
 571         /* generate big code generation switch */
 572 fprintf(outfile,
 573 "int dyngen_code(uint8_t *gen_code_buf,\n"
 574 "                const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
 575 "{\n"
 576 "    uint8_t *gen_code_ptr;\n"
 577 "    const uint16_t *opc_ptr;\n"
 578 "    const uint32_t *opparam_ptr;\n"
 579 "    gen_code_ptr = gen_code_buf;\n"
 580 "    opc_ptr = opc_buf;\n"
 581 "    opparam_ptr = opparam_buf;\n"
 582 "    for(;;) {\n"
 583 "        switch(*opc_ptr++) {\n"
 584 );
 585
 586         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
 587             const char *name;
 588             name = strtab + sym->st_name;
 589             if (strstart(name, OP_PREFIX, NULL)) {
 590 #if 0
 591                 printf("%4d: %s pos=0x%08x len=%d\n",
 592                        i, name, sym->st_value, sym->st_size);
 593 #endif
 594                 if (sym->st_shndx != (text_sec - shdr))
 595                     error("invalid section for opcode (0x%x)", sym->st_shndx);
 596                 gen_code(name, sym->st_value, sym->st_size, outfile,
 597                          text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 1);
 598             }
 599         }
 600
 601 fprintf(outfile,
 602 "        default:\n"
 603 "            goto the_end;\n"
 604 "        }\n"
 605 "    }\n"
 606 " the_end:\n"
 607 );
 608
 609 /* generate a return */
 610     switch(e_machine) {
 611     case EM_386:
 612         fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
 613         break;
 614     case EM_PPC:
 615         fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
 616         break;
 617     default:
 618         error("no return generation for cpu '%s'", cpu_name);
 619     }
 620
 621     fprintf(outfile, "return gen_code_ptr -  gen_code_buf;\n");
 622     fprintf(outfile, "}\n\n");
 623
 624 /* generate gen_xxx functions */
 625 /* XXX: suppress the use of these functions to simplify code */
 626         for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
 627             const char *name;
 628             name = strtab + sym->st_name;
 629             if (strstart(name, OP_PREFIX, NULL)) {
 630                 if (sym->st_shndx != (text_sec - shdr))
 631                     error("invalid section for opcode (0x%x)", sym->st_shndx);
 632                 gen_code(name, sym->st_value, sym->st_size, outfile,
 633                          text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 0);
 634             }
 635         }
 636     }
 637
 638     close(fd);
 639     return 0;
 640 }
 641
 642 void usage(void)
 643 {
 644     printf("dyngen (c) 2003 Fabrice Bellard\n"
 645            "usage: dyngen [-o outfile] [-c] objfile\n"
 646            "Generate a dynamic code generator from an object file\n"
 647            "-c     output enum of operations\n"
 648            );
 649     exit(1);
 650 }
 651
 652 int main(int argc, char **argv)
 653 {
 654     int c, do_print_enum;
 655     const char *filename, *outfilename;
 656     FILE *outfile;
 657
 658     outfilename = "out.c";
 659     do_print_enum = 0;
 660     for(;;) {
 661         c = getopt(argc, argv, "ho:c");
 662         if (c == -1)
 663             break;
 664         switch(c) {
 665         case 'h':
 666             usage();
 667             break;
 668         case 'o':
 669             outfilename = optarg;
 670             break;
 671         case 'c':
 672             do_print_enum = 1;
 673             break;
 674         }
 675     }
 676     if (optind >= argc)
 677         usage();
 678     filename = argv[optind];
 679     outfile = fopen(outfilename, "w");
 680     if (!outfile)
 681         error("could not open '%s'", outfilename);
 682     load_elf(filename, outfile, do_print_enum);
 683     fclose(outfile);
 684     return 0;
 685 }